Computer: Makeuper: CSS: Outline: Difference between revisions

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而使用 CSS 時,必須要先瞭解「元素 element」的概念。
而使用 CSS 時,必須要先瞭解「元素 element」的概念。


元素簡單說是成對的 HTML 標籤,如「<body> </body>」或「<p> </p>」還有「<div> </div>」等的都算,你可以利用如上面那個例子所說明的,在這些標籤內加入個 ClassName 或 IdName ,以將 CSS 的樣式套用進該元素中。
元素簡單說是成對的 HTML 標籤,如「&lt;body&gt; &lt;/body&gt;」或「&lt;p&gt; &lt;/p&gt;」還有「&lt;div&gt; &lt;/div&gt;」等的都算,你可以利用如上面那個例子所說明的,在這些標籤內加入個 ClassName 或 IdName ,以將 CSS 的樣式套用進該元素中。


另外「標籤 tag 」則是指「元素的名稱」這樣的感覺,如元素 body 的標籤就是 body ,也就是說「<body> </body>」叫元素,而「body」就是其標籤的意思。
另外「標籤 tag 」則是指「元素的名稱」這樣的感覺,如元素 body 的標籤就是 body ,也就是說「&lt;body&gt; &lt;/body&gt;」叫元素,而「body」就是其標籤的意思。


== 「類別 class」與「本我 id」 ==
== 「類別 class」與「本我 id」 ==
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* 順帶一提,這個 id 還可以拿來當做「前往文件內部的連結」的目的地的名稱。如:
* 順帶一提,這個 id 還可以拿來當做「前往文件內部的連結」的目的地的名稱。如:
*# 某段落元素 p 的 id 叫 nana : <p id="nana"> </p>
*# 某段落元素 p 的 id 叫 nana : &lt;p id="nana"&gt; &lt;/p&gt;
*# 那麼可以在同一份文件中建立一個超連結方便跳至該段落 : <a href="#nana"> </a>
*# 那麼可以在同一份文件中建立一個超連結方便跳至該段落 : &lt;a href="#nana"&gt; &lt;/a&gt;
*# 位在不同份的文件的話,在上述的「#IdName」前面加上目的地文件的檔名即可 : <a href="HtmlFileName.html#nana"> </a>
*# 位在不同份的文件的話,在上述的「#IdName」前面加上目的地文件的檔名即可 : &lt;a href="HtmlFileName.html#nana"&gt; &lt;/a&gt;


=== class ===
=== class ===
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# class 可以和 id 一起在同一個 tag 中使用
# class 可以和 id 一起在同一個 tag 中使用


class 跟 id 的使用方法是一樣的,「<p class="nana_class"> </p>」便能將 class 使用在段落元素 p 上面了。
class 跟 id 的使用方法是一樣的,「&lt;p class="nana_class"&gt; &lt;/p&gt;」便能將 class 使用在段落元素 p 上面了。


想知道何時該使用 class ,何時該用 id ,可以看看 [[Computer: Makeuper: XHTML|好孩子的 X(Extensible)HTML 教室]] 中的「XML 是什麼」。
想知道何時該使用 class ,何時該用 id ,可以看看 [[Computer: Makeuper: XHTML|好孩子的 X(Extensible)HTML 教室]] 中的「XML 是什麼」。
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***[[Computer: Makeuper: CSS: Ex03|製作各類表格]]
***[[Computer: Makeuper: CSS: Ex03|製作各類表格]]
***[[Computer: Makeuper: CSS: Ex04|製作正體中文的注音標示及日文的ふりがな標示]]
***[[Computer: Makeuper: CSS: Ex04|製作正體中文的注音標示及日文的ふりがな標示]]
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Latest revision as of 21:38, 26 February 2006

回到 Computer ‧ 回到 Computer: Makeuper

回到 Computer: Makeuper: CSS


CSS

CSS 是「階層式樣式表Cascading Style Sheets】」的縮寫。

是用來定義 HTML 的畫面效果,如文字顏色、畫面背景、各元素的框線、排版、滑鼠效果等樣式用的。

簡單呈現CSS的用處

在以往,我們寫一份 HTML 文件時,會這麼寫下面這樣子的玩意。(請自行複製貼上到你的 網頁編輯軟體的純文字編輯區中來看其呈現的結果)

<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=big5">
</head>
<body>
<ol>
<li><font color="red" size="100%">example_01</font></li>
<li><font color="red" size="100%">example_02</font></li>
<li><font color="red" size="100%">example_03</font></li>
<li><font color="red" size="100%">example_04</font></li>
<li><font color="red" size="100%">example_05</font></li>
</ol>
</body>
</html>

這時一定會有人覺得寫得又長又臭又難修改的很煩人吧。CSS的優點之一就在此時發揮功效了。

<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=big5">

<style type="text/css">
<!--
ol.eg01 li { color:red; font-size:100%; }
-->
</style>

</head>
<body>

<ol class="eg01">
<li>example_01</li>
<li>example_02</li>
<li>example_03</li>
<li>example_04</li>
<li>example_05</li>
</ol>

</body>
</html>

這樣一來,本來要逐項修改底下同樣式的字體顏色跟字體大小的,但用了 CSS 後只要去處理 <head> 處的 <style type="text/css"> 處的 CSS 語法,那麼在被宣告 CLASS 為 eg01 的 <OL> 底下的所有未被宣告其它 CLASS 與 ID 的 <LI> 就通通會依照 <head> 處的 <style type="text/css"> 處的 CSS 語法所宣告的內容而變化了。

  • 也就是說, CSS 的重點在於
    1. 把 HTML 文件中指定外觀的語法(即 HTML 中的標籤 tag 中的屬性 attribute 及其值 value)抽離,並替換上用 CSS 定義過樣式的 CLASS 及 ID 的名稱,來將 CSS 的樣式套用進各「元素 element」中。
    2. 並且利用定義 HTML 文件中的 element 所套用的 CLASS 及 ID 的方式,以達到套用同一個 CLASS 及 ID 的 element 的樣式能夠被一致化。
    3. 另外 CSS 的能玩的花樣也比 HTML 的屬性多很多這樣。

使用CSS時的基本用語

CSS 是必須要嚴格要求其寫法的,從「套用css到文件中」這一章開始會慢慢地跟各位說明其規則。

HTML文件中的「構成元素 element」

而使用 CSS 時,必須要先瞭解「元素 element」的概念。

元素簡單說是成對的 HTML 標籤,如「<body> </body>」或「<p> </p>」還有「<div> </div>」等的都算,你可以利用如上面那個例子所說明的,在這些標籤內加入個 ClassName 或 IdName ,以將 CSS 的樣式套用進該元素中。

另外「標籤 tag 」則是指「元素的名稱」這樣的感覺,如元素 body 的標籤就是 body ,也就是說「<body> </body>」叫元素,而「body」就是其標籤的意思。

「類別 class」與「本我 id」

接著你會需要理解 CLASS 跟 ID 的概念。這兩者即是將 CSS 的樣式套用至元素上的關鍵屬性。

另外先說明一件事,不論是 class 還是 id ,名稱第一個字都不可以用「數字」開頭。如「123456」或「1abcd」都是錯誤的。

id =

  1. 一份文件中只會有一個 id
  2. 一個世界中只會有一個我
  3. 不同的世界中也會有同樣的我存在
  4. 不同的文件也會有同樣的 id 存在

沒錯,一份文件只會有唯一一個的 id 名稱,同樣名稱的 id 是不會共存於同一份文件中的,不過一份文件中可以存在著許多不同名字的 id ,不同的文件中也可以存在著共用同樣名稱的 id ,但是「一份文件中不會有重覆名稱的 id 存在」。

  • 順帶一提,這個 id 還可以拿來當做「前往文件內部的連結」的目的地的名稱。如:
    1. 某段落元素 p 的 id 叫 nana : <p id="nana"> </p>
    2. 那麼可以在同一份文件中建立一個超連結方便跳至該段落 : <a href="#nana"> </a>
    3. 位在不同份的文件的話,在上述的「#IdName」前面加上目的地文件的檔名即可 : <a href="HtmlFileName.html#nana"> </a>

class

  1. 一份文件中可存在有複數的同名稱的 class
  2. class 可以和 id 一起在同一個 tag 中使用

class 跟 id 的使用方法是一樣的,「<p class="nana_class"> </p>」便能將 class 使用在段落元素 p 上面了。

想知道何時該使用 class ,何時該用 id ,可以看看 好孩子的 X(Extensible)HTML 教室 中的「XML 是什麼」。


各瀏覽器之間的差異

另外因為 Internet Explorer 6.0 以下對 CSS 的某些重要的樣式並不進行支援,所以在使用時請自行衡量一下,以免寫出來的網頁有人看來變得亂七八糟就有點尷尬了,該注意的樣式會在說到時提醒各位的,不必太擔心。

想嘹解「各瀏覽器對CSS的支援度」可以看這一頁


好孩子的CSS講義其目錄